JPS62109209A - Magnetic head - Google Patents

Abstract

PURPOSE:To form a magnetic head with a high erasure efficiency suitable for high density magnetic recording or miniaturization of a magnetic disc while magnetic saturation is hardly caused even when the thickness of the tip of an erasure core is made thin by forming a magnetic thin film to the side face of the tip of the erasure core chip in slide contact with the magnetic recording medium via a nonmagnetic layer. CONSTITUTION:A magnetic thin film 61 made of a high permeability material is formed to a side face of a tip 10 in slide contact with a magnetic recording medium (not shown in figure) in the erasure core chip 60 via a nonmagnetic layer 62. The magnetic thin film 61 is formed by sputtering, e.g., a 'Sendust(R)' in a thickness of several mum. Further, the nonmagnetic layer 62 is formed by sputtering an SiO2 in a thickness of 5-10mum. In order to make the tip of the erasure core 7 thin, a reinforcement glass part 15 is provided further at the outer side face orthogonal to the side face provided with the magnetic thin film 61 via the nonmagnetic layer 62 of the tip 10.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnetic head, and particularly to a magnetic head for a magnetic recording/reproducing device that records and reproduces signals using a magnetic recording medium such as a magnetic disk. It is.

[Conventional technology]

Conventionally, the so-called straddle type magnetic head, which combines a recording/reproducing head and an erasing head, has a third
It was constructed as shown in Figures 7 to 7. That is, a core holder 1 made of ceramics or the like is formed with a first fitting groove 2 extending in one direction and a second fitting groove 3 extending orthogonally thereto. A recording/reproducing core 4 made of ferrite is fitted into the fitting groove 2, and a glass layer 5 for forming a recording/reproducing gap is provided approximately at the center of the recording/reproducing core 4.

The erase core chip 6 is fitted into the second fitting/#3. This erase core chip 6 is made by integrally connecting two erase cores 7.7 made of ferrite, magnetic material, etc. with a non-magnetic connecting member 8 made of glass or the like. A groove portion 9 for straddling a part of the recording/reproducing core 4 fitted to the core holder l is formed approximately in the center of the erasing core chip 6 on the side facing the magnetic recording medium (not shown). 9
The tip 10.10 of each erased core 7.7 on the outside of the
is arranged in such a way that

After the recording/reproducing core 4 and the erasing core chip 6 are sequentially fitted into the first and second fitting grooves 2 and 3 of the core holder l, the core holder 1, the recording/reproducing core 4, and the erasing core chip 6 are fitted into the first and second fitting grooves 2 and 3 of the core holder l. A binding material block 11 made of glass or the like is inserted into the gap. Then, by heating to a temperature higher than the melting point of the binder block 11, the core holder 1, the recording/reproducing core 4, and the erasing core chip 6 are bonded together.
The recording/reproducing core 4 and the erasing core chip 6 are positioned. Thereafter, assembly of the magnetic head is completed by carefully polishing the surface that contacts the magnetic recording medium.

By the way, when trying to increase the density of magnetic recording in magnetic recording media such as magnetic disks, or to downsize the magnetic recording medium with the same recording capacity, the number of recording and reproducing tracks per unit length is As the number of recording and reproducing tracks increases, the width of each recording/reproducing track and the gap between adjacent recording/reproducing tracks become narrower. Correspondingly, it is necessary to reduce the width W (see FIG. 6) of the recording/reproducing core 4, as well as the thickness t at the tip 10 of the erasing core 7, for example, as shown in FIGS. 6 and 7. It is necessary to make it thin as shown in the figure. Note that reference numeral 15 is a reinforcing portion made of the same glass material as the binding material block 11, and is integrated with the binding material block 11 after assembly.

[Problem that the invention seeks to solve]

By the way, as mentioned above, if the thickness t of the tip 10 of the erase core 7 is thin (if it is made of ferrite, the tip 10 will be easily magnetically saturated, and the erase efficiency in the erase gap (Eg) will decrease. This becomes an obstacle to increasing the density of magnetic recording.

An object of the present invention is to solve these conventional problems and provide a magnetic head in which the erase core does not undergo magnetic saturation even when performing high-density recording.

[Means for solving problems]

The magnetic head of the present invention improves the erasing efficiency of the erasing core by forming a magnetic thin film made of a high magnetic permeability material with a non-magnetic material layer interposed on at least one side of the erasing core parallel to the recording/reproducing gap. This is how it was done.

〔Example〕

Next, one embodiment of the present invention will be described using FIGS. 1 and 2 and FIG. 8. The magnetic head of this embodiment is similar to the conventional magnetic head shown in FIGS. 31 to 7.
A first fitting groove 2 and a second fitting groove 3 are formed in the core holder I, and a recording/reproducing core 4 and a pair of erasing core chips 0 according to the present invention are sequentially fitted into these grooves d42 and 3. ing.

Since the configuration of the recording/reproducing core 4 is the same as that of the conventional one, a detailed explanation thereof will be omitted.

In the erase core chip 60, a magnetic thin film 61 made of a high magnetic permeability material is formed on the side surface of the tip portion 10 that comes into sliding contact with a magnetic recording medium (not shown) with a non-magnetic material layer 62 interposed therebetween. This magnetic thin film 61 is made of iron-Ninogal alloy (permalloy), iron-
The non-magnetic material layer 62 is formed by sputtering Sendust to a thickness of several μm.For example, it is formed by sputtering Sendust to a thickness of several μm. )S
It is formed by sputtering iOz to a thickness of 5 to 10 μm.

In addition, since the tip portion lO of the erase core 7 is made thin, a reinforcing glass portion 15 is further provided on the outer surface perpendicular to the side surface on which the magnetic thin film 61 is provided via the non-magnetic material layer 62 of the tip portion 10. There is.

This erase core thousand knob 60 is inserted into the core holder l as described above.
After that, the bonding +A block 11 made of glass having the same melting point as the reinforcing glass part 15 is inserted into the second fitting groove 3 of the core holder l, the recording/reproducing core 4, and the erasing core chip 60. Insert it into the gap between. Then, by heating the bonding material block 11 and the reinforcing glass portion 15 to a temperature higher than their melting points, the core holder 1, the recording/reproducing core 4, and the erasing core chip 60 are bonded together. After that,
The assembly of the magnetic head is completed by precisely polishing the surfaces of the core holder l, the tip end portions of the recording/reproducing core 4 and erasing core chip 60 which are in contact with the magnetic recording medium.

In this example, the magnetic thin film 61 was formed on the side surface on the downstream side with respect to the traveling direction of the magnetic recording medium (the direction of the arrow shown in FIG. 2), with the non-magnetic material layer 62 interposed therebetween. Of course, the film 61 and the nonmagnetic material layer 62 may be formed on the side surface of the tip portion 10 facing the recording/reproducing core 4.

According to the magnetic head of this embodiment configured in this way,
The erase magnetic field in a conventional magnetic head has a bimodal distribution that becomes weaker at the tip 10 of the erase core chip 7, as schematically shown on the lower side of FIG. As schematically shown, due to the presence of the magnetic thin film 61 through the non-magnetic material layer 62, the tip IO of the erase core chip 60 is not so weak, that is, the valley between the two peaks is not so deep. Compared to the magnetic head shown in FIG.

〔Effect of the invention〕

As described above, since a magnetic thin film is formed on the side surface of the tip of the erase core chip through a non-magnetic material layer, which is in direct contact with the magnetic recording medium, the thickness of the tip of the erase core can be reduced (
Therefore, it is possible to provide a magnetic head with high erasing efficiency, which is suitable for high-density magnetic recording in which magnetic saturation is difficult to occur even when magnetic saturation occurs, or for miniaturization of solid-state disks.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the present invention. Fig. 6 is a side view of an erasing core chip of a magnetic head. Fig. 2 is an enlarged top view of the main parts of the magnetic head shown in Fig. 1. Fig. 3 is a conventional magnetic head. FIG. 4 is a top view of the main parts of a conventional magnetic head in which the tip of the erase core is thick, and FIG. 5 is a side view of the erase core chip shown in FIG. Figure 6 is a top view of the main parts of a conventional magnetic head in which the tip of the erase core is thin, Figure 7 is a side view of the erase core chip shown in Figure 6, and Figure 8 is a magnetic head according to the present invention. Schematic % formula showing a comparison of the distribution of the erasing magnetic field between the Henode and the conventional magnetic head % 4...recording/reproducing core, 7... erasing core, 8... - connecting material, 9 ...Groove portion, 10...Tip portion, 15...Reinforcing glass portion, 60...Erasing core chip, 61...N-type thin film, 62...・It is a non-magnetic material layer. Fig. 1 Fig. 2 Delusion Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 8;

Claims (4)

[Claims] (1) In a magnetic head in which erasing cores made of ferrite or magnetic alloy are provided on both sides of a recording/reproducing core, and an erasing gap is formed between the recording/reproducing core and the erasing core, the recording/reproducing gap of the erasing core A magnetic head characterized in that a magnetic thin film made of a high magnetic permeability material is formed on at least one of parallel side surfaces with a nonmagnetic material layer interposed therebetween. (2) Claim 1, characterized in that the magnetic thin film is formed of any one of an iron-nickel alloy, an iron-aluminum-silicon alloy, and an amorphous alloy.
The magnetic head described in Section 1. (3) The magnetic head according to claim 1, wherein the magnetic thin film is formed by any one of sputtering, vapor deposition, and plating. (4) The magnetic head according to claim 1, wherein the nonmagnetic material layer is made of silicon dioxide.